what is the difference between an unknown sample and a control

what is the difference between an unknown sample and a control

What are control samples?

Control samples are reference materials with a matrix composition close to that of the analyzed samples, and which elemental mass fractions are close to the expected ones in the unknown samples. They should also be stable over time, and be available in sufficient amount as to be used for years.

What are questioned samples?

The sample in question, the one that was collected as evidence; compared to a known sample. For example, a questioned fingerprint would be one collected at a crime scene and it would be compared to standards or exemplars collected from suspects or other persons that might have deposited it.

What is a control sample in CSI?

Control sample – material of a known source that presumably was uncontaminated during the commission of the crime. Cross-contamination – The unwanted transfer of material between two or more sources of physical evidence.

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What is the difference between questioned and known evidence?

Questioned evidence that may have been transferred to an offender during the commission of the crime and taken away by him or her. Such questioned evidence can be compared with evidence of a known source and can thereby be associated/linked to a person/ vehicle/tool of a crime.Sep 3, 2009

What is the difference between a questioned sample and a control sample?

In forensic science, a control sample is one whose origin is known. It is collected from the victim or suspects for comparison with the unknown or questioned crime scene evidence. In a laboratory context, a control is often a sample used to test a method, and a standard is a known sample.

What is meant by control sample?

Control samples, sometimes referred to as substrate samples, are swabbings or cuttings from an unstained portion of the surface material near the recovered stain. The control sample should be packaged separately and clearly labeled.

What is an example of a control sample?

Examples of control samples include known combustible substances used for arson cases, known drug samples for suspected illegal drug samples, known blood types in violent crime investigations, and known DNA types for trace evidence cases.

What is a control sample and why is it important?

Control samples are any type of well-known forensic samples used to assure analyses are properly performed so that results are reliable. Also called controls, known samples, and knowns, these control samples are fully known to the forensic community with respect to composition, identification, source, and type.

What is a control sample?

Control samples are reference materials with a matrix composition close to that of the analyzed samples, and which elemental mass fractions are close to the expected ones in the unknown samples. They should also be stable over time, and be available in sufficient amount as to be used for years.

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What is the unknown or questioned sample?

Unknown/questioned sample – evidence of unknown origin; these samples could be found at a crime scene, transferred to an offender during commission of a crime, or recovered from more than one crime scene.

What is a known sample in forensics?

Control samples are any type of well-known forensic samples used to assure analyses are properly performed so that results are reliable. Also called controls, known samples, and knowns, these control samples are fully known to the forensic community with respect to composition, identification, source, and type.

How do forensic scientists identify unknown substances?

Forensic drug chemists analyze samples of unknown materials including powders, liquids and stains to determine the chemical identity or characteristics of the compounds that make up the sample. Samples submitted as evidence in a drug-related case can contain one compound or a mixture of many compounds.

What is a known sample?

A known reference sample is a DNA sample obtained from a particular individual (i.e. buccal swab from a victim or suspect). Known reference samples should be collected as buccal swabs. A buccal swab is a swabbing of the inside of a person's cheek and gum area.

What is an unknown sample in forensics?

Unknown/questioned sample – evidence of unknown origin; these samples could be found at a crime scene, transferred to an offender during commission of a crime, or recovered from more than one crime scene.

What is a control sample Why do we use it?

Control samples are any type of well-known forensic samples used to assure analyses are properly performed so that results are reliable. Also called controls, known samples, and knowns, these control samples are fully known to the forensic community with respect to composition, identification, source, and type.

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What is a control sample quizlet?

control sample. sample that is similar to the questioned and known samples, and is used to to validate the test method and procedure; ex) previous handwritten note by Joe matches the uknown note. transient evidence.

Where should forensic detectives get control samples from what are control samples used for?

Control samples are acquired through any source that is considered completely reliable and whose identification has been verified through proper authorities. These sources include commercial vendors and manufacturers for such items as ammunition, fibers , and paints.

What is a control sample in a crime scene?

Control samples, sometimes referred to as substrate samples, are swabbings or cuttings from an unstained portion of the surface material near the recovered stain. The control sample should be packaged separately and clearly labeled.

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